The Airbnb is in a perfect location. It's just off the main Sukhumvit road, but within 5 min. walking of the BTS and MRT stations, which gets you within vicinity of the main tourist attractions in Bangkok. It's within 5 minutes walking of the Terminal 21 Mall, which is a 9-story tall shopping center full of restaurants, food court (meals for ~$1 each) and stores (incl. high-end, street-market-style stalls).
The space is large enough to comfortably fit 5-6 people and not feel crammed. There are 3 bedrooms (each w/ a full bathroom), a relatively large living/dining area, and a small kitchen. On the same floor, there is an indoor courtyard area w/ tables and a waterfall, a shared gym with the essentials (dumbbells, several machines, treadmills, etc.), an infinity pool, and a sauna.
Aoy was a great host. Super responsive, kind, and stayed up late for check in.
Only critique is the beds are very firm. I think this may just be the style in Thailand, as another Airbnb also had firm beds.